Autopoiesis and Mobile Technology Adoption: The Case of Wireless Collaboration. - Robert William Kay; Michael Er (MOBIS, 2004)

Towards An Activity Theory Perspective on Mobile Information Systems. - Michael Er; Robert W. Kay (ACIS, 2005)

Mobile Technology Adoption for Mobile Information Systems: An Activity Theory Perspective. - Michael Er; Robert William Kay (ICMB, 2005)

Technology adoption and the mobile worker: The case of the field journalist. - Michael Er (CollaborateCom, 2007)

Longitudinal Study of Mobile Technology Adoption: Evolution at Work. - Elaine Lawrence; Michael Er (ICDS, 2007)

Information Systems and Activity Theory: A Case Study of Doctors and Mobile Knowledge Work. - Michael Er; Robert William Kay; Elaine Lawrence (ITNG, 2010)

The information system of mobile knowledge workers : an activity theory perspective of information sources and interaction - Michael Er (2010)

Using Activity Theory to Examine Information Systems for Supporting Mobile Work. - Michael Er; Elaine Lawrence (Bled eConference, 2011)